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Promising Paths: What Have We Learned So Far About Quantum Gravity?
- Abhay Ashtekar Pennsylvania State University
- Carlo Rovelli Aix-Marseille University
July 26, 2013

PIRSA:13070083
Scenes From Polymer Quantization

Viqar Husain University of New Brunswick

July 26, 2013

PIRSA:13070082
Diffeomorphism Invariant Gauge Theories

Kirill Krasnov University of Nottingham

July 26, 2013

PIRSA:13070081
Spontaneous Dimensional Reduction?

Steve Carlip University of California, Davis

July 26, 2013

PIRSA:13070070
Closing Remarks

July 25, 2013

PIRSA:13070094
Canonical Quantum Gravity - 4
- Suzanne Lanery Universidad Nacional Autónoma De Mexico (UNAM)
- Maximilian Hanusch Universität Paderborn
- Yongge Ma Beijing Normal University
July 25, 2013

PIRSA:13070078
Group Field Theory and Tensor Models - 2
- Stephane Dartois École Normale Supérieure de Lyon (ENS Lyon)
- Lorenzo Sindoni Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)
- Joseph Ben Geloun Laboratoire d'Informatique de Paris-Nord (LIPN)
- Dine Ousmane Samary CEA Saclay
July 25, 2013

PIRSA:13070076
Discrete Approaches - 3
- Ghanashyam Date Institute of Mathematical Sciences
- Jacek Puchta University of Warsaw
- Bianca Dittrich Perimeter Institute for Theoretical Physics
- Sumati Surya Raman Research Institute
July 25, 2013

PIRSA:13070079
Phenomenology - 4
- Stefano Bianco Sapienza University of Rome
- Giovanni Amelino-Camelia Sapienza Università di Roma - Dipartimento di Fisica
- Angel Ballesteros Universidad de Burgos
- Hans Westman
July 25, 2013

PIRSA:13070077
Group Field Theory and Tensor Models - 1
- Matti Raasakka Université Sorbonne Paris Nord (Paris 13)
- Thomas Krajewski Aix-Marseille University
- Daniele Oriti Complutense University of Madrid
- James Ryan Vinted (Germany)
- Valentin Bonzom Gustave Eiffel University
July 25, 2013

PIRSA:13070072
Canonical Quantum Gravity - 3
- Casey Tomlin Pennsylvania State University
- Saeed Rastgoo Universidad Nacional Autónoma de México (UNAM) - Centro de Ciencias Matematicas
- Javier Olmedo Pennsylvania State University
- Alexander Stottmeister University of Erlangen-Nuremberg
July 25, 2013

PIRSA:13070074
Phenomenology - 3
- Ivette Fuentes University of Southampton
- Stephon Alexander Brown University
- Astrid Eichhorn Universität Heidelberg
- Djordje Minic Virginia Polytechnic Institute and State University
- Antonino Marciano Fudan University
July 25, 2013

PIRSA:13070073

Promising Paths: What Have We Learned So Far About Quantum Gravity?
- Abhay Ashtekar Pennsylvania State University
- Carlo Rovelli Aix-Marseille University
July 26, 2013

PIRSA:13070083

In LQG we work in the spirit of Antonio Machado: "Traveler, there is no path; Paths are made by walking." I will present a bird's eye view of some of the paths that have emerged since Loops 11 and offer a few suggestions.

I try to make the point about what we know and what we do not yet know about the possibility of writing a quantum theory of gravity.
Scenes From Polymer Quantization

Viqar Husain University of New Brunswick

July 26, 2013

PIRSA:13070082

A regime of "polymer quantum field theory on curved spacetime" should emerge in a low energy approximation of quantum gravity based on LQG ideas. This era should be characterized by a polymer scale, and give modifications to the usual semiclassical approximation. I will describe work on gravitational collapse, cosmology, and statistical mechanics in this setting. Results include models of horizon evaporation, inflation and graceful exit without an inflaton potential, and an indication of dimensional reduction from 4 to 2.5 dimensions.
Diffeomorphism Invariant Gauge Theories

Kirill Krasnov University of Nottingham

July 26, 2013

PIRSA:13070081

I will describe a very large class of gauge theories that do not use any external structure such as e.g. a spacetime metric in their construction. When the gauge group is taken to be SL(2) these theories describe interacting gravitons, with GR being just a particular member of a whole family of gravity theories. Taking larger gauge groups one obtains gravity coupled to various matter systems. In particular, I will show how gravity together with Yang-Mills gauge fields arise from one and the same diffeomorphism invariant gauge theory Lagrangian. Finally, I will describe what is known about these theories quantum mechanically.
Spontaneous Dimensional Reduction?

Steve Carlip University of California, Davis

July 26, 2013

PIRSA:13070070

Several lines of evidence hint that quantum gravity at distances a bit larger than the Planck scale may become effectively two-dimensional. I will summarize the evidence for this "spontaneous dimensional reduction," and suggest a further argument based on the effect of vacuum fluctuations on light cones. If this description proves to be correct, it suggests an interesting relationship between small-scale quantum spacetime and the behavior of cosmologies near a spacelike singularity.
Closing Remarks

July 25, 2013

PIRSA:13070094
Canonical Quantum Gravity - 4
- Suzanne Lanery Universidad Nacional Autónoma De Mexico (UNAM)
- Maximilian Hanusch Universität Paderborn
- Yongge Ma Beijing Normal University
July 25, 2013

PIRSA:13070078
Group Field Theory and Tensor Models - 2
- Stephane Dartois École Normale Supérieure de Lyon (ENS Lyon)
- Lorenzo Sindoni Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)
- Joseph Ben Geloun Laboratoire d'Informatique de Paris-Nord (LIPN)
- Dine Ousmane Samary CEA Saclay
July 25, 2013

PIRSA:13070076
Discrete Approaches - 3
- Ghanashyam Date Institute of Mathematical Sciences
- Jacek Puchta University of Warsaw
- Bianca Dittrich Perimeter Institute for Theoretical Physics
- Sumati Surya Raman Research Institute
July 25, 2013

PIRSA:13070079
Phenomenology - 4
- Stefano Bianco Sapienza University of Rome
- Giovanni Amelino-Camelia Sapienza Università di Roma - Dipartimento di Fisica
- Angel Ballesteros Universidad de Burgos
- Hans Westman
July 25, 2013

PIRSA:13070077
Group Field Theory and Tensor Models - 1
- Matti Raasakka Université Sorbonne Paris Nord (Paris 13)
- Thomas Krajewski Aix-Marseille University
- Daniele Oriti Complutense University of Madrid
- James Ryan Vinted (Germany)
- Valentin Bonzom Gustave Eiffel University
July 25, 2013

PIRSA:13070072
Canonical Quantum Gravity - 3
- Casey Tomlin Pennsylvania State University
- Saeed Rastgoo Universidad Nacional Autónoma de México (UNAM) - Centro de Ciencias Matematicas
- Javier Olmedo Pennsylvania State University
- Alexander Stottmeister University of Erlangen-Nuremberg
July 25, 2013

PIRSA:13070074
Phenomenology - 3
- Ivette Fuentes University of Southampton
- Stephon Alexander Brown University
- Astrid Eichhorn Universität Heidelberg
- Djordje Minic Virginia Polytechnic Institute and State University
- Antonino Marciano Fudan University
July 25, 2013

PIRSA:13070073

Title	Date	Collection	Type	Info
Promising Paths: What Have We Learned So Far About Quantum Gravity?	2013‑07‑26	Loops 13	Conference	View details
Scenes From Polymer Quantization	2013‑07‑26	Loops 13	Conference	View details
Diffeomorphism Invariant Gauge Theories	2013‑07‑26	Loops 13	Conference	View details
Spontaneous Dimensional Reduction?	2013‑07‑26	Loops 13	Conference	View details
Closing Remarks	2013‑07‑25	Loops 13	Conference	View details
Canonical Quantum Gravity - 4	2013‑07‑25	Loops 13	Conference	View details
Group Field Theory and Tensor Models - 2	2013‑07‑25	Loops 13	Conference	View details
Discrete Approaches - 3	2013‑07‑25	Loops 13	Conference	View details
Phenomenology - 4	2013‑07‑25	Loops 13	Conference	View details
Group Field Theory and Tensor Models - 1	2013‑07‑25	Loops 13	Conference	View details
Canonical Quantum Gravity - 3	2013‑07‑25	Loops 13	Conference	View details
Phenomenology - 3	2013‑07‑25	Loops 13	Conference	View details

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